[TenTec] PSK Interface

[Robert & Linda McGraw K4TAX]

For some time I have connected the sound card input and output direct to the
rear audio OUT and audio IN of my Omni VI+.  I adjust the level of the sound
card via the software, use the VOX to do the TR switching and with this
configuration, I've worked a lot of PSK-31.  With a TX output of some 35 to
45 watts I consistently get IMD reports of 30 dB or better.  The MIC level
control remains in the same position (about 9 o'clock) as used for SSB.
Processor MUST be off.

Interfaces are nice and in many cases are necessary especially where one
needs to go into the MIC input and needs to use the SPKR output of a
transceiver.    Also, if the AC power grounds are not common between the rig
and the computer a ground loop can cause lots of problems.  In this case
some type of interface or transformer isolation is needed.

I use a 705 mike so I don't have to worry about "room noises" being picked
up because the mike is off unless the PTT switch is active.  A word of
caution, since the computer sound card is connected to the input of the
transceiver, any musical sounds produced by the computer may be transmitted
by the transceiver.  I turn off all the Windows sounds because I don't like
to hear them in the first place.  Normally I use PTT for SSB work.

Happy PSK'in

73
Bob K4TAX

----- Original Message -----
From: <duffyb01@fuse.net>
To: "Edmonds JB" <jedmonds@dit.state.va.us>; "'wo8lattnet'" <wo8l@att.net>;
<tentec@contesting.com>
Sent: Wednesday, February 13, 2002 1:32 PM
Subject: Re: RE: [TenTec] PSK Interface


> Donner Digital Interfaces are only $40.  I have two of them, one for the
Jupiter and one for the Kenwood.  It is important that at the very least you
use isolation transformers.  You can go into the Omni directly, but a spike
through the computer could damage your rig.  For $40, prebuilt on the Donner
interface, you can't go wrong.
>
> http://home.att.net/~n8st/
>
> Duffy - WB8NUT
>
>
> >
> > From: "Edmonds, J.B." <jedmonds@dit.state.va.us>
> > Date: 2002/02/13 Wed AM 08:25:46 EST
> > To: "'wo8l@att.net'" <wo8l@att.net>,  tentec@contesting.com
> > Subject: RE: [TenTec] PSK Interface
> >
> > Not knowing exactly your setup, I think that you can use the "audio in"
> > jack.  You do have to key the rig however and that's the part you did
not
> > address.  You may also have to lower the input audio level.  Many of the
PSK
> > web sites show you a circuit to provide "audio in", "audio out" and
keying.
> > Do you have "vox' on?
> >
> > You can buy a prebuilt interface for about $20 or go the "RigBlaster"
route
> > for a few dollars more.  Tentec gives us the jacks on the back so we
need
> > not use a mike connection and that's how mine work.  I have the mike
> > connected and my PSK connected to the rear.  Worlks great.
> >
> > 73  JB  N4NQY
> >
> > -----Original Message-----
> > From: wo8l@att.net [mailto:wo8l@att.net]
> > Sent: Sunday, December 30, 2001 3:56 PM
> > To: tentec@contesting.com
> > Subject: [TenTec] PSK Interface
> >
> >
> > Hi,
> >
> > How do I interface an OMNI V to my computer for PSK.
> > Receive is easy.
> >
> > However, I cannot transmit by connecting to the "audio
> > in" plug on the back of the rig.
> >
> > Do I need to go directly through the microphone plug on
> > the front of the rig?  Do I need an external interface?
> >
> > Thanks in advance,
> >
> > Rick
> > WO8L
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